Abstract
Deep underground engineering rock masses are usually located within triaxial stress state; therefore, it is more relevant to investigate the failure mechanical behavior of rock material containing pre-existing fissures under triaxial compression. However, only few experimental or numerical investigations are carried out for failure mechanical behavior of pre-cracked rock material under triaxial compression. Therefore, in this chapter, to better understand the strength failure crack coalescence phenomena in fractured rock mass under triaxial stress state, two-dimensional discrete element simulation was conducted for red sandstone specimens containing two coplanar fissures under triaxial stress state. The emphasis of this chapter is focused on to investigate the influence of coplanar fissure angle on deformation strength parameters of red sandstone material under triaxial compression to analyze the crack initiation propagation coalescence processes in red sandstone material under different confining pressures.
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